CN114428402A - Virtual image display device and method for manufacturing virtual image display device - Google Patents

Abstract

Provided are a virtual image display device and a method for manufacturing the virtual image display device, which are excellent in display quality. A virtual image display device includes a1 st display module and a 2 nd display module, and a connection part, wherein the 1 st display module includes a1 st display element and a support member thereof, a1 st projection optical system and a support member thereof, the 1 st display element support member includes one of a1 st convex portion and a1 st concave portion, the 1 st projection optical support member includes the other, the 1 st convex portion and the 1 st concave portion are disposed in the 1 st concave portion with a gap therebetween, the 2 nd display module includes a 2 nd display element and a support member thereof, a2 nd projection optical system and a support member thereof, wherein the 2 nd display element support member has one of a 2 nd convex portion and a 2 nd concave portion, the 2 nd projection optical support member has the other, the 2 nd convex portion and the 2 nd concave portion are disposed in the 2 nd concave portion with a gap therebetween, and a coupling portion has an adjustment structure capable of adjusting at least one of a relative rotational position, a longitudinal direction, and a depth direction relative position of the two projection optical support members.

Description

Virtual image display device and method for manufacturing virtual image display device

Technical Field

The present invention relates to a virtual image display device and a method of manufacturing the virtual image display device.

Background

A virtual image display device is conventionally known that is capable of observing a virtual image by guiding image light emitted from a display element to the pupil of an observer using an optical element such as a projection lens. Patent document 1 discloses a virtual image display device including: a display element; a display element case that houses and supports the display element; a projection optical system that projects light from the display element; a lens barrel that houses and supports the projection optical system and is connected to the display element housing; and a light guide device that directs light from the projection optical system toward an eye of an observer so that the observer sees an image.

Patent document 1: japanese patent laid-open publication No. 2017-211674

Patent document 1 discloses the following: the display element is positioned with respect to the projection optical system using a positioning portion composed of a convex portion provided on one of the display element and the lens barrel and a concave portion provided on the other member. Patent document 1 discloses that a right-eye light guide optical system and a left-eye light guide optical system are disposed in front of the eyes of an observer by attaching the right-eye light guide optical system and the left-eye light guide optical system to frames, respectively.

In a conventional virtual image display device, a support member such as a lens barrel for supporting an optical member is required for positioning a display element and a projection optical system. However, since the right-eye light guide optical system and the left-eye light guide optical system are mounted on the frame, respectively, manufacturing errors and assembly tolerances of the frame may affect the accuracy of the position adjustment of the right-eye image and the left-eye image.

Disclosure of Invention

In order to solve the above problem, a virtual image display device according to one embodiment of the present invention includes: a1 st display module forming a1 st virtual image with respect to a right eye; a 2 nd display module forming a 2 nd virtual image with respect to a left eye; and a coupling part coupling the 1 st display module and the 2 nd display module, wherein the 1 st display module includes: a1 st display element that emits 1 st image light for forming a right-eye image; a1 st display element support member that supports the 1 st display element; a1 st projection optical system that projects the 1 st image light emitted from the 1 st display element to form a1 st emission pupil; and a1 st projection optical support member that supports the 1 st projection optical system, wherein the 1 st display element support member has one of a1 st convex portion and a1 st concave portion, the 1 st projection optical support member has the other of the 1 st convex portion and the 1 st concave portion, the 1 st convex portion is disposed inside the 1 st concave portion with a gap therebetween, and the 2 nd display module includes: a 2 nd display element that emits 2 nd image light for forming a left eye image; a 2 nd display element support member that supports the 2 nd display element; a 2 nd projection optical system that projects the 2 nd image light emitted from the 2 nd display element to form a 2 nd emission pupil; and a 2 nd projection optical support member that supports the 2 nd projection optical system, wherein the 2 nd display element support member has one of a 2 nd convex portion and a 2 nd concave portion, the 2 nd projection optical support member has the other of the 2 nd convex portion and the 2 nd concave portion, the 2 nd convex portion is disposed inside the 2 nd concave portion with a gap therebetween, and the coupling portion has an adjustment structure that enables adjustment of at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction of the 1 st projection optical support member and the 2 nd projection optical support member.

In a method for manufacturing a virtual image display device according to an aspect of the present invention, the virtual image display device includes: a1 st display module forming a1 st virtual image with respect to a right eye; a 2 nd display module forming a 2 nd virtual image with respect to a left eye; and a coupling part coupling the 1 st display module and the 2 nd display module, wherein the 1 st display module includes: a1 st display element that emits 1 st image light for the right eye; a1 st display element support member that supports the 1 st display element; a1 st projection optical system that projects the 1 st image light emitted from the 1 st display element to form a1 st emission pupil; and a1 st projection optical support member that supports the 1 st projection optical system, wherein the 1 st display element support member has one of a1 st convex portion and a1 st concave portion, the 1 st projection optical support member has the other of the 1 st convex portion and the 1 st concave portion, the 1 st convex portion is disposed inside the 1 st concave portion with a gap therebetween, and the 2 nd display module includes: a 2 nd display element that emits 2 nd image light for the left eye; a 2 nd display element support member that supports the 2 nd display element; a 2 nd projection optical system that projects the 2 nd image light emitted from the 2 nd display element to form a 2 nd emission pupil; and a 2 nd projection optical support member that supports the 2 nd projection optical system, wherein the 2 nd display element support member has one of a 2 nd convex portion and a 2 nd concave portion, the 2 nd projection optical support member has the other of the 2 nd convex portion and the 2 nd concave portion, the 2 nd convex portion is disposed inside the 2 nd concave portion with a gap therebetween, and the coupling portion has an adjustment structure that adjusts a relative positional relationship between the 1 st projection optical support member and the 2 nd projection optical support member, the method for manufacturing the virtual image display device including: a1 st adjustment step of adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, a relative position in a lateral direction, and a relative position in a depth direction of the 1 st display element support member and the 1 st projection optical support member in a state where the 1 st projection portion and the 1 st recess portion are fitted to each other; a 2 nd adjustment step of adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, a relative position in a lateral direction, and a relative position in a depth direction of the 2 nd display element support member and the 2 nd projection optical support member in a state where the 2 nd convex portion and the 2 nd concave portion are fitted; and a 3 rd adjustment step of adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction of the 1 st projection optical support member and the 2 nd projection optical support member using the adjustment structure of the coupling portion.

Drawings

Fig. 1 is an external perspective view showing a wearing state of a virtual image display device according to embodiment 1.

Fig. 2 is a longitudinal sectional view of the virtual image display device.

Fig. 3 is a longitudinal sectional view showing an internal configuration of the virtual image display device.

Fig. 4 is a longitudinal sectional view showing an optical system of the virtual image display device.

Fig. 5 is a top cross-sectional view illustrating an optical system of the virtual image display device.

Fig. 6 is a perspective view for conceptually illustrating imaging of the projection optical system.

Fig. 7 is a diagram for explaining forced distortion of a display image formed on a display element.

Fig. 8 is a perspective view of the display module.

Fig. 9 is an enlarged perspective view of the vicinity of the display element support member.

Fig. 10 is a perspective view of the projection optical system.

Fig. 11 is a perspective view of the 1 st display module and the 2 nd display module.

Fig. 12 is an enlarged plan view of the coupling portion.

Fig. 13 is a perspective view of the 1 st display module and the 2 nd display module in the virtual image display device according to embodiment 2.

Description of the reference symbols

11A: a1 st display element; 11B: a 2 nd display element; 12A: 1 st projection optical system; 12B: a 2 nd projection optical system; 21: projection lenses (1 st projection lens, 2 nd projection lens); 22: prisms (1 st prism, 2 nd prism); 23: a see-through mirror (1 st see-through mirror, 2 nd see-through mirror); 61A: 1 st display element support member; 61B: a 2 nd display element supporting member; 62A, 72A: 1 st projection optical support member; 62B, 72B: 2 nd projection optical support member; 65. 75: a connecting portion; 66: a connecting member; 100. 200: a virtual image display device; 101A, 201A: a1 st display module; 101B, 201B: a 2 nd display module; 611: convex portions (1 st convex portion, 2 nd convex portion); 611 a: the 1 st surface (the 1 st facing surface, the 7 th facing surface); 611 b: the 2 nd surface (the 2 nd facing surface, the 8 th facing surface); 611 d: the 4 th surface (the 3 rd facing surface, the 9 th facing surface); 621: a recess (1 st recess, 2 nd recess); 621 a: the 6 th surface (the 4 th opposed surface, the 10 th opposed surface); 621 b: the 7 th surface (the 5 th facing surface, the 11 th facing surface); 621 c: the 8 th surface (the 6 th opposed surface, the 12 th opposed surface); 622A: the 1 st adjustment projection; 622B: the 2 nd regulating projection; 663: an adjustment recess; 721 c: 1 st concavo-convex part; 721 d: a 2 nd concave-convex part; 721A: 1 st connecting part; 721B: a 2 nd connecting part; c1, C2, C3: a gap.

Detailed Description

[ embodiment 1 ]

Hereinafter, embodiment 1 of the present invention will be described with reference to fig. 1 to 12.

Fig. 1 is an external perspective view showing a wearing state of a virtual image display device according to the present embodiment. Fig. 2 is a longitudinal sectional view of the virtual image display device. Fig. 3 is a longitudinal sectional view showing an internal configuration of the virtual image display device.

In the drawings below, in order to make it easy to observe each component, the dimensions may be shown differently depending on the component.

As shown in fig. 1 and 2, the virtual image display device 100 of the present embodiment is a Head Mounted Display (HMD) having an appearance like glasses, and allows an observer or user US to recognize an image as a virtual image.

In fig. 1 and 2, X, Y and Z are vertical coordinate systems. The + X direction and the-X direction correspond to the arrangement direction of the eyes of the user US wearing the virtual image display device 100, and are defined as the horizontal direction in this specification. The + X direction corresponds to the right direction when viewed from the user US, and the-X direction corresponds to the left direction when viewed from the user US. The + Y direction and the-Y direction correspond to a direction perpendicular to the lateral direction of the arrangement of both eyes of the user US, and are defined as the longitudinal direction in this specification. The + Y direction corresponds to the upper direction, and the-Y direction corresponds to the lower direction. The + Z direction and the-Z direction are perpendicular to the + X direction and the-X direction, + Y direction and-Y direction, respectively, and correspond to the front-back direction when viewed from the user US, and are defined as the depth direction in this specification. The + Z direction corresponds to the front direction, and the + Z direction corresponds to the rear direction.

The virtual image display device 100 includes a1 st display module 101A forming a1 st virtual image with respect to the right eye, a 2 nd display module 101B forming a 2 nd virtual image with respect to the left eye, and a temple-shaped support member 101C supporting the 1 st display module 101A and the 2 nd display module 101B.

The 1 st display module 101A includes an optical unit 102 disposed on the upper side and an exterior member 103 covering the entire display module in a spectacle lens shape. The 2 nd display module 101B is composed of an optical unit 102 disposed on the upper side and an exterior member 103 covering the entire display module in a spectacle lens shape, as in the 1 st display module 101A. The support member 101C supports the 1 st display module 101A and the 2 nd display module 101B on the upper end side of the exterior member 103 by a member, not shown, disposed behind the exterior member 103.

Since the 2 nd display module 101B has the same configuration as the 1 st display module 101A, only the 1 st display module 101A will be described below, and the description of the 2 nd display module 101B will be omitted. In the following description, the 1 st display module 101A will be simply referred to as a display module 101A.

As shown in fig. 2 and 3, the display module 101A has a display element 11 and a projection optical system 12 as optical elements. The projection optical system 12 is also sometimes referred to as a light guide optical system from the viewpoint of guiding the image light ML from the display element 11 to the pupil position PP. The projection optical system 12 has a projection lens 21, a prism 22, and a see-through mirror 23.

The display module 101A of the present embodiment corresponds to the 1 st display module and the 2 nd display module of the present invention. The display element 11 of the present embodiment corresponds to the 1 st display element and the 2 nd display element of the claims. The projection optical system 12 of the present embodiment corresponds to the 1 st projection optical system and the 2 nd projection optical system of the claims. The projection lens 21 of the present embodiment corresponds to the 1 st projection lens and the 2 nd projection lens of the claims. The prism 22 of the present embodiment corresponds to the 1 st prism and the 2 nd prism of the present invention. The see-through mirror 23 of the present embodiment corresponds to the 1 st and 2 nd see-through mirrors according to the present invention.

The display element 11 is formed of a self-light-emitting display device typified by, for example, an organic Electroluminescence (EL) element, an inorganic EL element, a Light Emitting Diode (LED) array, an organic LED, a laser array, a quantum dot light-emitting element, or the like. The display element 11 forms a color still image or moving image on a two-dimensional display surface 11 a. The display element 11 is driven by a drive control circuit, not shown, to perform a display operation.

When an organic EL display panel or a display is used as the display element 11, the display device is configured to include an organic EL control unit. In the case of using a quantum dot light-emitting display as the display element 11, light of a blue light-emitting diode (LED) is irradiated to the quantum dot film, whereby green or red color light is emitted. The display element 11 is not limited to a self-luminous display element, and may be formed of a Liquid Crystal Display (LCD) or another light modulation element, and an image is formed by illuminating the light modulation element with a light source such as a backlight. Instead of the LCD, LCOS (Liquid crystal on silicon, LCOS is a registered trademark), a digital micromirror device, or the like may be used for the display element 11. The display element 11 may be formed of a single display element, or may have the following structure: the display device includes a plurality of display elements and a combining element such as a dichroic prism, and combines and emits a plurality of lights from the plurality of display elements by the combining element.

As shown in fig. 3, the projection lens 21 converges the image light ML emitted from the display element 11 into a state of a nearly parallel light flux. The projection lens 21 is a single lens in the illustrated example, and has an incident surface 21a and an emission surface 21 b. The prism 22 has an incident surface 22a, an internal reflection surface 22b, and an output surface 22 c. The prism 22 refractively enters the image light ML emitted from the projection lens 21 on the incident surface 22a, totally reflects the image light ML on the internal reflection surface 22b, and refractively emits the image light ML from the emission surface 22 c. The see-through mirror 23 reflects the image light ML emitted from the prism 22 toward the pupil position PP to form an exit pupil. The position where the exit pupil is formed is referred to as a pupil position PP. The image light from each point on the display surface 11a enters the pupil position PP in a predetermined divergent state or parallel state so as to overlap in the angular direction corresponding to the position of each point on the display surface 11 a. In the projection optical system 12 of the present embodiment, the FOV (field of view) is 44 °. The display area based on the virtual image of the projection optical system 12 is rectangular, and the above-mentioned 44 ° is an angle in the diagonal direction. In the present embodiment, the 1 st display module 101A for the right eye is described as a representative, and therefore the above-described exit pupil corresponds to the 1 st exit pupil according to the present invention. The exit pupil formed by the 2 nd display module 101B for the left eye corresponds to the 2 nd exit pupil in the technical proposal.

The projection lens 21 and the prism 22 are housed in the case 51 together with the display element 11. The housing 51 is made of a light-shielding material and incorporates a drive circuit, not shown, for operating the display element 11. The housing 51 has an opening 51a, and the opening 51a has a size such that the image light ML from the prism 22 toward the see-through mirror 23 does not interfere with the housing 51. The opening 51a of the case 51 is covered with a light-transmitting protective cover 52. The protective cover 52 has no optical power and is formed of a material such as resin that allows the image light ML to pass therethrough without attenuation. The protective cover 52 can seal the housing space in the housing 51, and can improve functions such as dust prevention, dew prevention, and prevention of contact with an optical surface. The see-through mirror 23 is supported by the housing 51 via a support plate 54. The housing 51 or the support plate 54 is supported by a support member 101C shown in fig. 1, and the appearance member 103 is constituted by the support plate 54 and the see-through mirror 23.

The projection optical system 12 is constituted by an off-axis optical system, and the projection lens 21, the prism 22, and the see-through mirror 23 are arranged at positions constituting the off-axis system 112. The off-axis optical system here means that the entire optical path is bent before and after the light beam enters at least 1 reflection surface or refraction surface in the projection lens 21, the prism 22, and the see-through mirror 23 constituting the projection optical system 12. In the projection optical system 12, that is, the axis shift system 112, the optical axis AX is bent SO as to extend along the axis shift plane SO corresponding to the paper surface.

That is, in the projection optical system 12, the projection lens 21, the prism 22, and the see-through mirror 23 are arranged along the off-axis plane SO by bending the optical axis AX within the off-axis plane SO. The decentering plane SO is a plane that generates asymmetry in multiple stages in the decentering system 112. In this specification, the optical axis AX is defined as an axis extending along an optical path of a principal ray emitted from the center of the display element 11 and passing through the center of the pupil or the view ring ER corresponding to an eye point (eyepoint). That is, an off-axis plane SO on which the optical axis AX is disposed is parallel to the YZ plane, and passes through the center of the display element 11 and the center of the eye ring ER corresponding to the eye point. The optical axis AX is arranged in a zigzag shape when viewed in cross section. That is, in the off-axis plane SO, the optical path P1 from the projection lens 21 to the internal reflection surface 22b, the optical path P2 from the internal reflection surface 22b to the see-through mirror 23, and the optical path P3 from the see-through mirror 23 to the pupil position PP are arranged to be folded back 2 times in a zigzag shape.

The optical path P1 from the projection lens 21 to the internal reflection surface 22b in the projection optical system 12 is configured to be approximately parallel to the Z direction. That is, in the optical path P1, the optical axis AX extends substantially parallel to the Z direction or the front direction. The projection lens 21 is disposed at a position sandwiched between the prism 22 and the display element 11 in the Z direction or the front direction. In this case, the light path P1 from the prism 22 to the display element 11 approaches the front direction. The direction of the optical axis AX on the optical path P1 preferably converges on average within a range of about-30 ° to +30 ° with the downward direction being negative and the upward direction being positive along the Z direction. By setting the optical axis AX of the optical path P1 to be at least-30 ° downward in the Z direction, interference between the projection lens 21 or the display element 11 and the see-through mirror 23 can be avoided. Further, by setting the optical axis AX of the optical path P1 to +30 ° or less upward in the Z direction, it is possible to suppress the projection lens 21 and the display element 11 from protruding upward and becoming conspicuous in appearance.

In the optical path P2 from the internal reflection surface 22b to the see-through mirror 23, the optical axis AX preferably converges on average in a range of about-70 ° to-45 ° with the downward direction being negative and the upward direction being positive along the Z direction. By setting the optical axis AX of the optical path P2 to be at least-70 ° downward in the Z direction, a space for disposing the inner lens 31 can be secured between the half mirror 23 and the pupil position PP, and an excessive inclination of the entire half mirror 23 can be avoided. Further, by setting the optical axis AX of the optical path P2 to be-45 ° or less downward in the Z direction, it is possible to avoid the arrangement in which the prism 22 protrudes greatly in the-Z direction or the rear surface direction with respect to the see-through mirror 23, and it is possible to avoid an increase in the thickness of the projection optical system 12.

An optical path P3 from the see-through mirror 23 to the pupil position PP is arranged to be approximately parallel to the Z direction. In the illustrated example, the optical axis AX is negative downward in the Z direction and is about-10 °. The reason for this is that the line of sight of the person is stabilized in a slightly lowered state inclined by about 10 ° downward from the horizontal direction. In addition, with respect to the pupil position PP shown in fig. 4, the horizontal central axis HX assumes the following case: the user US wearing the virtual image display apparatus 100 relaxes in an upright posture to look forward at a horizontal direction or horizon. Each user US wearing the virtual image display device 100 has various head shapes and postures including the arrangement of eyes and the arrangement of ears, but an average center axis HX can be set for the virtual image display device 100 of interest by assuming an average head shape or head posture of the user US. As a result, the reflection angle of the light ray along the optical axis AX is about 10 ° to 60 ° at the internal reflection surface 22b of the prism 22. In the see-through mirror 23, the reflection angle of the light ray along the optical axis AX is about 20 ° to 45 °.

Regarding the optical path P2 and the optical path P3 of the principal ray, the distance d1 between the see-through mirror 23 and the prism 22 is set to be equal to or less than the distance d2 between the see-through mirror 23 and the pupil position PP. In this case, the amount of projection of the prism 22 to the periphery of the see-through mirror 23, i.e., upward can be suppressed. Here, the distances d1, d2 are distances along the optical axis AX. When another optical element is added to the optical paths P2 and P3 inside the see-through mirror 23, the values of the distances d1 and d2 may be determined by converting the added optical element into an optical path length or an optical distance.

The projection optical system 12 has a position of the uppermost ray passing through the pupil position PP in the vertical direction or the Y direction of 30mm or less with reference to the center of the pupil position PP. By converging the light rays within such a range, the projection lens 21 and the display element 11 can be arranged so as not to protrude upward or in the + Y direction. This can suppress the projection amount of the projection lens 21 or the display element 11 above the eyebrows, thereby ensuring design. That is, the optical unit 102 including the display element 11, the projection lens 21, and the prism 22 can be downsized.

In the projection optical system 12, the position of all light rays from the half mirror 23 to the display element 11 is set to 13mm or more with reference to the pupil position PP in the front direction or the Z direction. By converging the light rays within such a range, the half mirror 23 can be arranged sufficiently apart from the pupil position PP in the front direction or the + Z direction. This makes it easy to secure a space for disposing the inner lens 31 on the reflecting surface 23a side of the see-through mirror 23.

In the projection optical system 12, the position of all light rays from the half mirror 23 to the display element 11 is set to 40mm or less with reference to the pupil position PP in the front direction or the Z direction. By converging the light rays within such a range, the half mirror 23 can be arranged so as not to be excessively separated in the front direction or the + Z direction with respect to the pupil position PP. This can suppress the front projection of the half mirror 23, the display element 11, and the like, and easily ensure design. The lower end of the prism 22 is disposed at a position of 10mm or more with respect to the center of the pupil position PP in the longitudinal direction or the Y direction. This makes it easy to secure a field of view in perspective, for example, 20 ° upward.

In the off-axis plane SO, an intermediate pupil IP is disposed between the projection lens 21 and the internal reflection surface 22b of the prism 22 on the side of the entrance surface 22a of the prism 22 with respect to the projection lens 21 and the internal reflection surface 22 b. More specifically, the intermediate pupil IP is disposed at the position of the entrance surface 22a of the prism 22 or in the vicinity thereof. For example, the intermediate pupil IP is disposed on the internal reflection surface 22b side with respect to the incident surface 22a of the prism 22. In this case, the position of the intermediate pupil IP is closer to the entrance surface 22a than the internal reflection surface 22 b. The intermediate pupil IP may be disposed on the projection lens 21 side with respect to the entrance surface 22a of the prism 22. In this case, the position of the intermediate pupil IP is closer to the incident surface 22a than the exit surface 21b of the projection lens 21. The intermediate pupil IP may also intersect the entrance face 22a of the prism 22. The intermediate pupil IP is a portion where image lights from respective points on the display surface 11a overlap each other at the widest, and is arranged at a conjugate point of the view ring ER or the pupil position PP. An aperture stop is preferably arranged at or near the position of the intermediate pupil IP.

The intermediate image IM is formed between the prism 22 and the see-through mirror 23. The intermediate image IM is formed closer to the prism 22 than the intermediate point between the half mirror 23 and the prism 22. By forming the intermediate image IM in the vicinity of the prism 22 in this manner, the burden of enlargement of the object by the see-through mirror 23 can be reduced, and the aberration of the observed virtual image can be suppressed. However, the intermediate image IM does not intersect the emission surface 22c of the prism 22. That is, intermediate image IM is formed outside emission surface 22c, and this arrangement relationship is not limited to the off-axis plane SO, and is established at any point in the lateral direction or X direction perpendicular to off-axis plane SO on emission surface 22 c. In this way, the intermediate image IM is formed so as not to cross the emission surface 22c of the prism 22, and thus it is easy to avoid the influence of dust or scratches on the surface of the emission surface 22c on image formation.

The intermediate image IM is a real image formed at a position conjugate to the display surface 11a on the upstream side of the optical path from the view ring ER. The intermediate image IM has a pattern corresponding to the display image on the display surface 11a, but does not need to be clearly imaged, and may also exhibit aberrations such as field curvature and distortion aberration. The aberration of the intermediate image IM does not become a problem if the aberration is finally corrected well for the virtual image observed at the pupil position PP.

Hereinafter, the details of the shapes of the projection lens 21, the prism 22, and the see-through mirror 23 will be described with reference to fig. 4 and 5.

Fig. 4 shows a longitudinal section through the projection optical system 12. Fig. 5 shows a top sectional view of the projection optical system 12. Fig. 5 shows a state in which the incident surface 21a and the output surface 21b of the projection lens 21, the incident surface 22a, the internal reflection surface 22b, the output surface 22c of the prism 22, and the reflection surface 23a of the see-through mirror 23 are projected onto the XZ plane through the optical axis AX.

The projection lens 21 of the present embodiment is formed of a single lens. The projection lens 21 may be configured by a plurality of lenses. The shapes of the incident surface 21a and the output surface 21b, which are optical surfaces constituting the projection lens 21, are asymmetrical with respect to the optical axis AX in the 1 st directions D11 and D12 in the vertical direction intersecting the optical axis AX within the off-axis plane SO parallel to the YZ plane, and symmetrical with respect to the optical axis AX in the 2 nd direction D02 or the X direction in the horizontal direction perpendicular to the 1 st directions D11 and D12. The 1 st direction D11 in the longitudinal direction of the incident surface 21a and the 2 nd direction D12 in the longitudinal direction of the output surface 21b form a predetermined angle.

The projection lens 21 is made of, for example, resin, but may be made of glass. The incident surface 21a and the output surface 21b of the projection lens 21 are each formed of a free curved surface, for example. The incident surface 21a and the output surface 21b are not limited to the free curved surfaces, and may be aspherical. In the projection lens 21, the incidence surface 21a and the emission surface 21b are formed as a free-form surface or an aspherical surface, whereby aberration can be reduced. Particularly, when a free-form surface is used, it is easy to reduce the aberration of the projection optical system 12 which is an off-axis optical system or a non-coaxial optical system. The free-form surface is a surface having no rotational symmetry axis, and various polynomials can be used as a surface function of the free-form surface. The aspherical surface is a surface having a rotational symmetry axis, but is a surface other than a paraboloid or a spherical surface represented by a polynomial. Although detailed description is omitted, an antireflection film is formed on the incident surface 21a and the emission surface 21 b.

As described above, in the projection lens 21, the 1 st direction D11 of the incident surface 21a and the 1 st direction D12 of the output surface 21b form a predetermined angle, and therefore, the output surface 21b is formed to be inclined with respect to the incident surface 21a with respect to the optical path of the principal ray from the center of the display surface 11a of the display element 11. That is, there is a relative angle or inclination between the incident surface 21a and the emission surface 21 b. Therefore, the eccentricity of the projection optical system 12 as the axis shift system 112 can be partially compensated in the projection lens 21, contributing to improvement of each aberration. Further, the relative inclination of the incident surface 21a and the output surface 21b can partially compensate for chromatic aberration of the projection lens 21.

The prism 22 is a refractive-reflective optical component having a function of combining a mirror and a lens. Therefore, the prism 22 refractively reflects the image light ML emitted from the projection lens 21. More specifically, in the prism 22, the image light ML enters the inside through an entrance surface 22a as a refractive surface, is totally reflected in the non-specular reflection direction by an internal reflection surface 22b as a reflection surface, and is emitted to the outside through an emission surface 22c as a refractive surface.

The incident surface 22a and the output surface 22c are optical surfaces formed of curved surfaces, and contribute to improvement in resolution as compared with the case of only a reflection surface or the case of making the incident surface 22a and the output surface 22c flat. The incident surface 22a, the internal reflection surface 22b, and the output surface 22c, which are optical surfaces constituting the prism 22, have asymmetry with respect to the optical axis AX in the 1 st direction D21, D22, and D23 in the vertical direction intersecting the optical axis AX, and have symmetry with respect to the optical axis AX in the 2 nd direction D02 or the X direction perpendicular to the 1 st direction D21, D22, and D23 in the off-axis plane SO parallel to the YZ plane. The lateral width Ph of the prism 22 in the lateral or X direction is greater than the longitudinal width Pv in the longitudinal or Y direction. Not only the physical shape, but also the lateral width of the prism 22 in the lateral or X direction is larger than the longitudinal width in the longitudinal or Y direction with respect to the optically effective area. This can increase the angle of view in the lateral or X direction. As will be described later, even if the line of sight changes largely in the lateral direction in accordance with the movement of the eye EY that is large in the lateral direction, an image can be seen.

The prism 22 is made of, for example, resin, but may be made of glass. The refractive index of the main body of the prism 22 is set to a value that realizes total reflection at the inner surface in consideration of the reflection angle of the image light ML. The refractive index and abbe number of the main body of the prism 22 are preferably set in consideration of the relationship with the projection lens 21. In particular, the abbe number of the prism 22 or the projection lens 21 can be increased to reduce the dispersion.

The incident surface 22a, the internal reflection surface 22b, and the output surface 22c, which are optical surfaces of the prism 22, are each formed of, for example, a free-form surface. The incident surface 22a, the internal reflection surface 22b, and the output surface 22c are not limited to free-form surfaces, and may be aspherical surfaces. In the prism 22, the incidence surface 22a, the internal reflection surface 22b, and the emission surface 22c are each formed as a free-form surface or an aspherical surface, whereby aberration can be reduced.

In particular, when a free-form surface is used, it is easy to reduce the aberration of the projection optical system 12, which is an off-axis optical system or a non-coaxial optical system, and the resolution can be improved. The internal reflection surface 22b is not limited to reflecting the image light ML by total reflection, and may be a reflection surface formed of a metal film or a dielectric multilayer film. In this case, a reflective film made of a single-layer film or a multilayer film made of a metal such as Al or Ag, for example, or a sheet-like reflective film made of a metal is attached to the internal reflection surface 22b by vapor deposition or the like. Although detailed description is omitted, an antireflection film is formed on the incident surface 22a and the emission surface 22 c.

Since the prism 22 can collectively form the incident surface 22a, the internal reflection surface 22b, and the output surface 22c by injection molding, the number of parts is reduced, and the relative positions of the 3 surfaces can be highly accurately positioned at a level of, for example, 20 μm or less at a relatively low cost.

The see-through mirror 23 is a plate-shaped optical member that functions as a concave surface mirror, and reflects the image light ML emitted from the prism 22. The see-through mirror 23 covers a pupil position PP where the eye EY or the pupil is arranged and has a concave shape when viewed from the pupil position PP. The see-through mirror 23 is formed of a reflecting plate having a structure in which a mirror film 23c is formed on one surface 23s of a plate-like body 23 b. The reflection surface 23a of the see-through mirror 23 is a transmissive surface reflection surface.

The reflecting surface 23a of the see-through mirror 23 has an asymmetrical shape with respect to the optical axis AX in the 1 st direction D31 in the longitudinal direction intersecting the optical axis AX within the off-axis plane SO parallel to the YZ plane, and has a symmetrical shape with respect to the optical axis AX in the 2 nd direction D02 or the X direction in the lateral direction perpendicular to the 1 st direction D31. The reflecting surface 23a of the see-through mirror 23 is formed of, for example, a free curved surface. The reflecting surface 23a is not limited to a free-form surface, and may be an aspherical surface. By making the half mirror 23a free-form surface or an aspherical surface, aberration can be reduced. Particularly, when a free-form surface is used, it is easy to reduce the aberration of the projection optical system 12 which is an off-axis optical system or a non-coaxial optical system.

In any case of the free curved surface and the aspherical surface of the reflecting surface 23a, the half mirror 23 has a shape in which the origin O of the curved surface type is shifted toward the projection lens 21 or the display element 11 side from the effective area EA of the half mirror 23. In this case, the inclined surface of the see-through mirror that realizes the zigzag optical path can be designed without imposing an excessive burden on the design of the optical system. The curved surface type of the reflecting surface 23a corresponds to the shape of the curve CF of the two-dot chain line, for example, on the off-axis surface SO. Therefore, the origin O to which symmetry is given is disposed between the upper end of the see-through mirror 23 and the lower end of the display element 11.

The half mirror 23 is a transmission-type reflecting element that reflects a part of the light incident on the half mirror 23 and transmits the other part of the light. Therefore, the mirror film 23c of the see-through mirror 23 has semi-transmissive reflectivity. Accordingly, since the outside light OL passes through the see-through mirror 23, the outside can be seen through, and the user can see a state where the virtual image and the outside image are superimposed.

By making the plate-like body 23b of the half mirror 23 as thin as about several mm or less, the change in magnification of the external image can be suppressed to be small. From the viewpoint of ensuring the brightness of the image light ML or facilitating the viewing of the external image through perspective, the reflectance of the mirror film 23c with respect to the image light ML and the external light OL is preferably 10% or more and 50% or less in the assumed incident angle range of the image light ML.

The plate-like body 23b serving as a base material of the see-through mirror 23 is made of, for example, resin, but may be made of glass. The plate-like body 23b is formed of the same material as the support plate 54 that supports the plate-like body 23b from the periphery, and has the same thickness as the support plate 54. The mirror film 23c is formed of, for example, a dielectric multilayer film including a plurality of dielectric layers with film thicknesses adjusted. The mirror film 23c may be a single-layer film or a multilayer film of a metal such as Al or Ag whose film thickness is adjusted. The reflecting mirror film 23c can be formed by laminating the above films, but can also be formed by adhering a sheet-like reflecting film.

The optical path in the projection optical system 12 will be described below.

The image light ML emitted from the display element 11 enters the projection lens 21 and is emitted from the projection lens 21 in a substantially collimated state. The image light ML having passed through the projection lens 21 is incident on the incident surface 21a of the prism 22 in a refracted manner, is reflected on the internal reflection surface 22b with a reflectance of approximately 100%, and is refracted again on the output surface 22 c. The image light ML emitted from the prism 22 enters the see-through mirror 23 and is reflected by the reflection surface 23a with a reflectance of about 50% or less. The image light ML reflected by the see-through mirror 23 is incident on a pupil position PP where an eye EY or a pupil of the user US is disposed.

An intermediate image IM is formed between the prism 22 and the see-through mirror 23 at a position close to the output surface 22c of the prism 22. The intermediate image IM is an image formed on the display surface 11a of the display element 11 after the image is appropriately enlarged. In addition to the image light ML, the external light OL passing through the half mirror 23 or the support plate 54 around the half mirror 23 enters the pupil position PP. That is, the user US wearing the virtual image display device 100 can observe the virtual image based on the image light ML so as to overlap with the external image.

As can be seen from a comparison of fig. 4 and 5, the FOV of the projection optical system 12 is larger in the lateral direction than in the longitudinal direction, i.e., the viewing angle α 2 is larger. This corresponds to the display image formed on the display surface 11a of the display element 11 being longer in the horizontal direction than in the vertical direction. The aspect ratio of the lateral dimension to the longitudinal dimension of the display surface 11a is set to, for example, 4: 3. 16: 9 is equivalent.

Fig. 6 is a perspective view conceptually illustrating imaging based on the projection optical system 12.

In fig. 6, the image light ML1 represents a light ray from the upper right direction in the field of view, the image light ML2 represents a light ray from the lower right direction in the field of view, the image light ML3 represents a light ray from the upper left direction in the field of view, and the image light ML4 represents a light ray from the lower left direction in the field of view.

In this case, the view ring ER set at the pupil position PP has a view ring shape or pupil size in which a lateral or X-direction lateral pupil size Wh perpendicular to the axis deviation plane SO is larger than a longitudinal or Y-direction longitudinal pupil size Wv located within the axis deviation plane SO and perpendicular to the optical axis AX. That is, with respect to the pupil size at the pupil position PP, the lateral or X direction perpendicular to the axis deviation plane SO is larger than the longitudinal or Y direction perpendicular to the lateral direction.

When the field angle or the field of view in the lateral direction is made larger than the field angle or the field of view in the longitudinal direction, the position of the eye is shifted largely in the lateral direction if the line of sight is changed in accordance with the field of view, and therefore, it is preferable to make the pupil size large in the lateral direction. That is, by making the transverse pupil size Wh of the eye ring ER larger than the longitudinal pupil size Wv, it is possible to prevent or suppress the image from being cut off when the line of sight is changed greatly in the transverse direction. In the case of the projection optical system 12 shown in fig. 4 and 5, the transverse FOV is relatively large and the longitudinal FOV is relatively small. As a result, the eye EY or pupil of the user US also rotates in a wide angular range in the lateral direction and rotates in a small angular range in the longitudinal direction. Accordingly, the transverse pupil size Wh of the eye ring ER is made larger than the longitudinal pupil size Wv of the eye ring ER in accordance with the movement of the eye EY.

As is clear from the above description, for example, when the FOV in the longitudinal direction of the projection optical system 12 is set to be larger than the FOV in the lateral direction, the pupil size Wh in the lateral direction of the view ring ER is preferably set to be smaller than the pupil size Wv in the longitudinal direction of the view ring ER. As described above, when the optical axis AX from the half mirror 23 to the pupil position PP is directed downward, the tilt of the view ring ER and the size of the view ring ER in a strict sense need to be considered based on the coordinate systems X0, Y0, and Z0 in which the optical axis AX is inclined downward in the Z0 direction. In this case, strictly speaking, the Y0 direction in the vertical direction does not coincide with the vertical direction or the Y direction. However, when such a tilt is not large, the tilt of the view ring ER and the size of the view ring ER are considered in the coordinate system X, Y, Z, and thus, there is approximately no problem.

Although not shown, when the FOV of the projection optical system 12 is larger in the lateral direction than in the longitudinal direction in accordance with the magnitude relationship between the lateral pupil size Wh and the longitudinal pupil size Wv of the view ring ER, it is also preferable to set the lateral pupil size in the X direction to be smaller than the longitudinal pupil size in the Y direction with respect to the intermediate pupil IP.

As shown in fig. 7, an original projected image IG0 showing the imaging state of the projection optical system 12 has a relatively large distortion. However, since the projection optical system 12 is the off-axis system 112, it is not easy to remove distortion such as keystone distortion. Therefore, even if distortion remains in the projection optical system 12, when the original display image is DA0, the display image formed on the display surface 11a is a corrected image DA1 having distortion in advance. That is, the image displayed on the display device 11 is a corrected image DA1 having a distortion opposite to the distortion formed by the projection lens 21, the prism 22, and the see-through mirror 23.

Thus, the pixel arrangement of the virtual projected image IG1 viewed at the pupil position PP via the projection optical system 12 can be made into a grid pattern corresponding to the DA0, and the outline of the projected image IG1 can be made rectangular. As a result, distortion aberration generated in the see-through mirror 23 and the like can be allowed, and aberration can be suppressed in the entire display module 101A including the display element 11. When the outer shape of the display surface 11a is rectangular, a blank space is formed in the peripheral edge portion of the display surface 11a due to the forced distortion, but additional information can be displayed in such a blank space. The corrected image DA1 formed on the display surface 11a is not limited to an image in which forced distortion is formed by image processing, and for example, the arrangement of display pixels formed on the display surface 11a may be made to correspond to the forced distortion. In this case, image processing for correcting distortion is not required. Further, the display surface 11a can also be curved to correct aberrations.

As described above, the distortion caused by the projection optical system 12 can be corrected by adding distortion that cancels the distortion caused by the projection optical system 12 to the image displayed on the display device 11. Conversely, distortion generated in the projection optical system 12 can be corrected by the display element 11, and therefore an optical system that allows generation of distortion can be employed. This can reduce the number of components of the display module and reduce the size of the display module.

However, when the component accuracy and the assembly accuracy of optical elements such as a projection lens, a prism, and a transillumination mirror constituting the projection optical system and the positional relationship between the projection optical system and the display element deviate from the optimum values, that is, the design values, the distortion generated in the projection optical system largely changes. As described above, by displaying an image having distortion that cancels distortion generated by the projection optical system on the display device, the distortion shape can be corrected. However, the larger the deviation from the optimum value of the above-described parameter, the more the resolution of the virtual image may be reduced by the distortion correction. In addition, when configuring a binocular head mounted display, it is necessary to adjust the left and right image positions so that there is no sense of discomfort in binocular observation. However, when the left and right image positions are adjusted by adjusting the position of the display element, the distortion generated by the projection optical system also changes, and therefore it is difficult to achieve both the correction of the distortion generated by the projection optical system and the adjustment of the left and right image positions.

The position adjustment structure of the projection optical system 12 and the display element 11 will be described in detail below.

Fig. 8 is a perspective view of the display module 101A. Fig. 9 is an enlarged perspective view of the vicinity of the display element support member. Fig. 10 is a perspective view of the projection optical system 12.

As described above, since the 1 st display module 101A and the 2 nd display module 101B have the same configuration, in the following description of the alignment structure of the projection optical system 12 and the display element 11, the 1 st display module 101A will be referred to as a display module, and the 1 st display module 101A will be simply referred to as the display module 101A.

As shown in fig. 8, the display module 101A includes a display element 11, a display element support member 61 that supports the display element 11, a projection optical system 12, and a projection optical support member 62 that supports the projection optical system.

The display element support member 61 of the present embodiment corresponds to the 1 st display element support member and the 2 nd display element support member of the present invention. The projection optical support member 62 of the present embodiment corresponds to the 1 st projection optical support member and the 2 nd projection optical support member of the claims.

As shown in fig. 9, the display element support member 61 has a display element support member main body 610 and 2 convex portions 611 protruding in the lateral direction from the side surface of the display element support member main body 610.

The convex portion 611 of the present embodiment corresponds to the 1 st and 2 nd convex portions of the present invention.

The display element support member main body 610 has a rectangular frame shape when viewed in the Z direction, which is the traveling direction of the image light emitted from the display element 11, and has an opening in the center. The display element 11 is supported on a surface of the display element support member main body 610 facing the projection optical system 12. The specific supporting structure of the display element 11 is not particularly limited, and may be, for example, a structure in which the display element 11 is bonded to the display element supporting member main body 610, or a structure in which the display element is supported via another supporting member.

As shown in fig. 9, the 2 convex portions 611 have convex portions 611 protruding rightward from the right side surface of the display element support member main body 610 and convex portions 611 protruding leftward from the left side surface of the display element support member main body 610, as viewed from the observer. Since the left and right 2 convex portions 611 have the same shape and size, the left convex portion 611 of the display element support member main body 610 will be described below.

The convex portion 611 has a substantially rectangular parallelepiped shape, and includes a1 st surface 611a perpendicular to the X direction, a 2 nd surface 611b perpendicular to the Y direction and serving as a lower surface of the convex portion 611, a 3 rd surface 611c facing the 2 nd surface 611b and serving as an upper surface of the convex portion 611, a 4 th surface 611d perpendicular to the Z direction and serving as a rear surface of the convex portion 611, and a 5 th surface 611e facing the 4 th surface 611d and serving as a front surface of the convex portion. The left and right 2 convex parts 611 may have different shapes or sizes.

The projection optical support member 62 includes: the projection optical support member main body 620; 2 recessed portions 621 provided in the projection optical support member main body 620 and opposed to the respective protruding portions 611 of the display element support member; and an adjustment convex portion 622 that protrudes in the lateral direction from the projection optical support member main body 620.

The recess 621 of the present embodiment corresponds to the 1 st recess and the 2 nd recess of the invention. The adjustment convex portion 622 of the present embodiment corresponds to the 1 st adjustment convex portion and the 2 nd adjustment convex portion of the present invention.

As shown in fig. 8, the projection optical support member main body 620 has 2 support portions 623 provided at predetermined intervals in the lateral direction, and a space between the 2 support portions 623 serves as a housing portion 625 for housing the display element support member 61. Each support portion 623 is provided with a concave portion 621 having a shape and a size capable of accommodating the convex portion 611, which faces the convex portion 611 of the display element support member 61. Since the left and right 2 concave portions 621 have the same shape and size, the left concave portion 621 of the projection optical support member main body 620 will be described below.

The recess 621 has a shape recessed so that the internal space becomes a substantially rectangular parallelepiped, and has a 6 th surface 621a perpendicular to the X direction, a 7 th surface 621b perpendicular to the Y direction, and an 8 th surface 621c perpendicular to the Z direction. The left and right 2 concave portions 621 may have different shapes or sizes, and may have a shape and size capable of receiving the convex portion 611 corresponding to the concave portion 621.

As shown in fig. 10, in the projection optical system 12 of the present embodiment, the projection lens 21, the prism 22, and the see-through mirror 23 are joined to each other via an adhesive layer (not shown). That is, the projection lens 21, the prism 22, and the see-through mirror 23 are mutually positioned without passing through other support members.

The projection lens 21 of the present embodiment corresponds to the 1 st projection lens and the 2 nd projection lens of the claims. The prism 22 of the present embodiment corresponds to the 1 st prism and the 2 nd prism of the present invention. The see-through mirror 23 of the present embodiment corresponds to the 1 st and 2 nd see-through mirrors according to the present invention.

The projection lens 21 has a projection lens main body 210 and a1 st positioning part 211 formed integrally with the projection lens main body 210. The prism 22 has a prism main body 220, and a 2 nd positioning part 221 and a 3 rd positioning part 222 formed integrally with the prism main body 220. The see-through mirror 23 has a see-through mirror main body 230 and a 4 th positioning part 231 formed integrally with the see-through mirror main body 230. The projection lens 21 and the prism 22 are positioned by the 1 st positioning part 211 and the 2 nd positioning part 221 contacting each other. The prism 22 and the see-through mirror 23 are positioned by the 3 rd positioning part 222 and the 4 th positioning part 231 contacting each other.

In this way, in the case of the present embodiment, the projection lens 21 is positioned with respect to the prism 22, and the see-through mirror 23 is positioned with respect to the prism 22, whereby the projection lens 21, the prism 22, and the see-through mirror 23 are mutually positioned. In this example, the prism 22 among the 3 optical members is used as a reference for positioning, but the optical member used as a reference for positioning may be the projection lens 21 or the see-through mirror 23.

As shown in fig. 9, the display element support member 61 is housed in the housing portion 625 of the projection optical support member 62 at a position where the convex portion 611 is housed inside the concave portion 621. In this state, the 1 st surface 611a of the convex portion 611 faces the 6 th surface 621a of the concave portion 621, the 2 nd surface 611b of the convex portion 611 faces the 7 th surface 621b of the concave portion 621, and the 4 th surface 611d of the convex portion 611 faces the 8 th surface 621c of the concave portion 621. However, the 1 st surface 611a and the 6 th surface 621a, the 2 nd surface 611b and the 7 th surface 621b, and the 4 th surface 611d and the 8 th surface 621c face each other, but the 2 nd surfaces may not directly contact each other. That is, the convex portion 611 is disposed inside the concave portion 621 with a gap C1 therebetween.

The 2 surfaces facing each other may be parallel to each other, or may not be parallel to each other. The 3 rd surface 611c and the 5 th surface 611e of the convex portion 611 are exposed to the outside without facing the surfaces of the concave portion 621.

The 1 st surface 611a of the present embodiment corresponds to the 1 st facing surface and the 7 th facing surface of the present invention. The 2 nd surface 611b of the present embodiment corresponds to the 2 nd facing surface and the 8 th facing surface of the present invention. The 4 th surface 611d of the present embodiment corresponds to the 3 rd facing surface and the 9 th facing surface of the present invention. The 6 th surface 621a of the present embodiment corresponds to the 4 th facing surface and the 10 th facing surface of the present invention. The 7 th surface 621b of the present embodiment corresponds to the 5 th facing surface and the 11 th facing surface of the present invention. The 8 th surface 621c of the present embodiment corresponds to the 6 th facing surface and the 12 th facing surface of the present invention.

The clearance C1 between the 1 st surface 611a and the 6 th surface 621a, between the 2 nd surface 611b and the 7 th surface 621b, and between the 4 th surface 611d and the 8 th surface 621C is, for example, about several tens μm to 1mm, and is larger than the clearance required for assembling general components. As described later, the 3-part gaps C1 are used to adjust the positional relationship between the display element support member 61 and the projection optical support member 62, and therefore do not need to be the same size. An adhesive layer (not shown) is provided in the 3 gaps C1. That is, the display element support member 61 and the projection optical support member 62 are fixed to each other by the adhesive layer provided in the gap C1 of the 3 locations in a state where the positional relationship between each other is adjusted.

The following describes in detail the structure for adjusting the positions of the 1 st display module 101A for the right eye and the 2 nd display module 101B for the left eye.

Fig. 11 is a perspective view of the 1 st display module 101A and the 2 nd display module 101B. Fig. 12 is an enlarged plan view of the connection portion 65 between the 1 st display module 101A and the 2 nd display module 101B.

As shown in fig. 11, the virtual image display device 100 according to the present embodiment includes a1 st display module 101A, a 2 nd display module 101B, and a connection section 65 that connects the 1 st display module 101A and the 2 nd display module 101B. The coupling section 65 has an adjustment structure for adjusting at least one of the relative rotational position, the relative position in the longitudinal direction, and the relative position in the depth direction of the 1 st projection optical support member 62A and the 2 nd projection optical support member 62B.

In the description so far, since the 1 st display module 101A and the 2 nd display module 101B have the same configuration, the ordinal numbers of "1 st" and "2 nd" are omitted from the names of the respective constituent elements, but in the following description, the ordinal numbers of "1 st" and "2 nd" are assigned to the names of the respective constituent elements in order to distinguish the constituent elements of the 1 st display module 101A from the constituent elements of the 2 nd display module 101B.

The coupling portion 65 of the present embodiment includes a coupling member 66 that is provided separately from the 1 st projection optical support member 62A and the 2 nd projection optical support member 62B and couples the 1 st projection optical support member 62A and the 2 nd projection optical support member 62B. The coupling member 66 includes a base portion 661, a clamping portion 662 provided integrally with the base portion 661, and an adjustment recess 663 provided in the base portion 661.

The 1 st projection optical support member 62A has a1 st adjustment convex portion 622A for adjusting at least one of a relative rotational position with respect to the 2 nd projection optical support member 62B, a relative position in the longitudinal direction, and a relative position in the depth direction. The 1 st adjustment convex portion 622A is formed of a plate portion protruding from the 1 st projection optical support member main body in one of the lateral directions (+ X direction).

The 2 nd projection optical support member 62B has a 2 nd adjustment convex portion 622B for adjusting at least one of a relative rotational position, a relative position in the longitudinal direction, and a relative position in the depth direction with respect to the 1 st projection optical support member 62A. The 2 nd adjustment convex portion 622B is formed of a plate portion extending from the 2 nd projection optical support member main body to the other side in the lateral direction (the (-X direction).

In the coupling member 66, the clamping portion 662 is composed of a1 st clamping portion 662A that clamps the 1 st adjusting protrusion 622A from the depth direction and a 2 nd clamping portion 662B that clamps the 2 nd adjusting protrusion 622B from the depth direction. As shown in fig. 12, the adjustment concave portion 663 includes a1 st adjustment concave portion 663A that accommodates the 1 st adjustment convex portion 622A and a 2 nd adjustment concave portion 663B that accommodates the 2 nd adjustment convex portion 622B. That is, the coupling member 66 has an adjustment concave portion 663 that accommodates the 1 st adjustment convex portion 622A and the 2 nd adjustment convex portion 622B. In the present embodiment, the adjustment concave portion 663 is formed of 2 adjustment concave portions 663A and 663B that accommodate the adjustment convex portions 622A and 622B, respectively, but instead of this configuration, it may be formed of 1 adjustment concave portion that accommodates both the 1 st adjustment convex portion 622A and the 2 nd adjustment convex portion 622B.

The 1 st adjusting protrusion 622A has an 11 th surface 622A perpendicular to the X direction, a 12 th surface 622b perpendicular to the Y direction and serving as a lower surface of the 1 st adjusting protrusion 622A, a 13 th surface 622c serving as an upper surface of the 1 st adjusting protrusion 622A, a 14 th surface 622d perpendicular to the Z direction and serving as a front surface of the 1 st adjusting protrusion 622A, and a 15 th surface 622e serving as a rear surface of the 1 st adjusting protrusion 622A. The 2 nd adjusting projection 622B has a 16 th surface 622f perpendicular to the X direction, a 17 th surface 622g perpendicular to the Y direction and serving as a lower surface of the 2 nd adjusting projection 622B, an 18 th surface 622h serving as an upper surface of the 2 nd adjusting projection 622B, a 19 th surface 622i perpendicular to the Z direction and serving as a front surface of the 2 nd adjusting projection 622B, and a 20 th surface 622j serving as a rear surface of the 2 nd adjusting projection 622B.

The 1 st adjustment recess 663A has a 21 st surface 663A perpendicular to the X direction, a 22 nd surface 663b perpendicular to the Y direction, and a 23 rd surface 663c and a 24 th surface 663d perpendicular to the Z direction and facing each other. The 2 nd adjustment recess 663B has a 25 th surface 663e perpendicular to the X direction, a 26 th surface 663f perpendicular to the Y direction, and a 27 th surface 663g and a 28 th surface 663h perpendicular to the Z direction and facing each other.

As shown in fig. 11, the 1 st projection optical support member 62A is fixed to the connecting member 66 in a state where the 1 st adjustment convex portion 622A is accommodated in the 1 st adjustment concave portion 663A. In this state, as shown in fig. 12, the 11 th surface 622A of the 1 st convex adjustment portion 622A faces the 21 st surface 663A of the 1 st concave adjustment portion 663A, the 12 th surface 622b of the 1 st convex adjustment portion 622A faces the 22 nd surface 663b of the 1 st concave adjustment portion 663A, the 14 th surface 622d of the 1 st convex adjustment portion 622A faces the 23 th surface 663c of the 1 st concave adjustment portion 663A, and the 15 th surface 622e of the 1 st convex adjustment portion 622A faces the 24 th surface 663d of the 1 st concave adjustment portion 663A. However, the 11 th surface 622a and the 21 st surface 663a, the 12 th surface 622b and the 22 nd surface 663b, the 14 th surface 622d and the 23 rd surface 663c, and the 15 th surface 622e and the 24 th surface 663d are opposed to each other, but may not be in direct contact with each other. That is, the 1 st adjusting convex portion 622A is disposed inside the 1 st adjusting concave portion 663A with a clearance C2 between the 1 st adjusting concave portion 663A. The 2 surfaces facing each other may be parallel to each other, or may not be parallel to each other. The 13 th surface 622c of the 1 st adjustment convex portion 622A is exposed to the outside without facing the surface of the 1 st adjustment concave portion 663A.

As shown in fig. 11, the 2 nd projection optical support member 62B is fixed to the connecting member 66 in a state where the 2 nd adjustment convex portion 622B is accommodated in the 2 nd adjustment concave portion 663B. In this state, as shown in fig. 12, the 16 th surface 622f of the 2 nd convex adjustment portion 622B faces the 25 th surface 663e of the 2 nd concave adjustment portion 663B, the 17 th surface 622g of the 2 nd convex adjustment portion 622B faces the 26 th surface 663f of the 2 nd concave adjustment portion 663B, the 19 th surface 622i of the 2 nd convex adjustment portion 622B faces the 27 th surface 663g of the 2 nd concave adjustment portion 663B, and the 20 th surface 622j of the 2 nd convex adjustment portion 622B faces the 28 th surface 663h of the 2 nd concave adjustment portion 663B. However, the 16 th surface 622f and the 25 th surface 663e, the 17 th surface 622g and the 26 th surface 663f, the 19 th surface 622i and the 27 th surface 663g, and the 20 th surface 622j and the 28 th surface 663h face each other, but may not directly contact each other. That is, the 2 nd adjusting convex portion 622B is disposed inside the 2 nd adjusting concave portion 663B with a gap C2 therebetween. The 2 surfaces facing each other may be parallel to each other or may not be parallel to each other. The 18 th surface 622h of the 2 nd adjustment convex portion 622B is exposed to the outside without facing the surface of the 2 nd adjustment concave portion 663B.

The clearance C2 is, for example, about several tens μm to 1mm, and is larger than a clearance required for assembling general components. As described later, the gaps C2 at the plurality of positions are used to adjust the positional relationship between the 1 st display module 101A and the 2 nd display module 101B, and therefore do not need to be the same size. The adhesive layer 67 is provided in the gaps C2 at a plurality of locations. That is, the 1 st projection optical support member 62A and the 2 nd projection optical support member 62B are fixed to the coupling member 66 by the adhesive layer 67 provided in the gaps C2 at the plurality of portions in a state where the positional relationship between the members is adjusted, and are coupled to each other via the coupling member 66.

In manufacturing the virtual image display device 100 according to the present embodiment, in the 1 st display module 101A, the 1 st display element support member 61A and the 1 st projection optical support member 62A are aligned to adjust the relative position of the 1 st display element 11A and the 1 st projection optical system 12A, and in the 2 nd display module 101B, the 2 nd display element support member 61B and the 2 nd projection optical support member 62B are aligned to adjust the relative position of the 2 nd display element 11B and the 2 nd projection optical system 12B, and the display element support members 61A and 61B and the projection optical support members 62A and 62B are bonded to each other with an adhesive. Thereafter, the relative positions of the 1 st display module 101A and the 2 nd display module 101B are adjusted by adjusting the positions of the 1 st projection optical support member 62A and the coupling member 66 and the positions of the 2 nd projection optical support member 62B and the coupling member 66, and the projection optical support members 62A and 62B are bonded to the coupling member 66 using an adhesive.

Hereinafter, a method of adjusting the position of each member will be specifically described.

Since the positional adjustment of the display element support members 61A and 61B and the projection optical support members 62A and 62B is the same for the 1 st display module 101A and the 2 nd display module 101B, the description will be made with the 1 st display module 101A as a representative, and the "1 st" ordinal number of each member is omitted.

First, as shown in fig. 9, the positions of the display element support member 61 and the projection optical support member 62 in the display module 101A are adjusted. At this time, the position of the display element support member 61 is adjusted in a state where the position of the projection optical support member 62 is fixed while checking the display state of the virtual image at the pupil position.

At this time, since the clearance C1 of, for example, about 1mm is provided between the convex portion 611 and the concave portion 621, in a state where the convex portion 611 is disposed in the concave portion 621, the relative position in the lateral direction (X direction), the relative position in the longitudinal direction (Y direction), the relative position in the depth direction (Z direction), and the relative rotational position around the X axis, the relative rotational position around the Y axis, and the relative rotational position around the Z axis of the display element support member 61 and the projection optical support member 62 can be adjusted, respectively. That is, by providing the gap C1 between the convex portion 611 and the concave portion 621, the position of the display element support member 61 and the projection optical support member 62 in the 6-axis direction can be adjusted.

Next, after the positional adjustment of the display element support member 61 and the projection optical support member 62 in the 6-axis direction is completed, an adhesive is injected into the gap C1 between the convex portion 611 and the concave portion 621 while maintaining the positional relationship between the display element support member 61 and the projection optical support member 62, and the adhesive is cured. As the adhesive, for example, an adhesive made of an ultraviolet curable resin can be used, and the applied adhesive can be cured by irradiating ultraviolet light thereto. The type of the adhesive is not particularly limited. In place of the above-described steps, the adhesive may be applied to at least one of the convex portions 611 and the concave portions 621, the positions of the display element support member 61 and the projection optical support member 62 may be adjusted, and then the adhesive may be cured.

Next, the 1 st display module 101A and the 2 nd display module 101B are adjusted in position. At this time, the relative positional relationship between the 1 st display module 101A and the 2 nd display module 101B is adjusted while confirming the display state of the virtual images at both eyes, and the display positions, the convergence (convergence) distances, and the like of the horizontal direction, the vertical direction, and the rotational direction of the left and right virtual images are adjusted.

Here, as one step, for example, after the 2 nd display module 101B is temporarily fixed to the coupling member 66, the positional relationship between the 1 st display module 101A and the coupling member 66 is adjusted. At this time, as shown in fig. 12, since the clearance C2 of, for example, about 1mm is provided between the 1 st adjustment convex portion 622A and the 1 st adjustment concave portion 663A, in a state where the 1 st adjustment convex portion 622A is disposed in the 1 st adjustment concave portion 663A, the relative position in the lateral direction (X direction), the relative position in the longitudinal direction (Y direction), the relative position in the depth direction (Z direction), the relative position around the X axis, the relative position around the Y axis, and the relative position around the Z axis of the 1 st display module 101A and the coupling member 66 can be adjusted, respectively.

Thereby, the positional relationship between the 1 st display module 101A and the coupling member 66 can be adjusted, and as a result, the positional relationship between the 1 st display module 101A and the 2 nd display module 101B can be adjusted. Further, through the above-described procedure, when the positional relationship between the 1 st display module 101A and the 2 nd display module 101B cannot be appropriately adjusted, the positional relationship between the 2 nd display module 101B and the coupling member 66 may be further adjusted. In addition, in contrast to the above-described procedure, the 1 st display module 101A may be temporarily fixed to the coupling member 66, and then the positional relationship between the 2 nd display module 101B and the coupling member 66 may be adjusted. According to any of the steps, in the virtual image display device 100 of the present embodiment, the position adjustment in the 6-axis direction of the 1 st display module 101A and the 2 nd display module 101B can be performed by providing the gaps C2 between the 1 st adjusting convex portion 622A and the 1 st adjusting concave portion 663A and between the 2 nd adjusting convex portion 622B and the 2 nd adjusting concave portion 663B.

After the 6-axis direction position adjustment of the 1 st display module 101A and the 2 nd display module 101B is completed, the adhesive is injected into the gap C2 between the 1 st adjustment convex portion 622A and the 1 st adjustment concave portion 663A and between the 2 nd adjustment convex portion 622B and the 2 nd adjustment concave portion 663B while maintaining the positional relationship between the 1 st display module 101A and the 2 nd display module 101B, and the adhesive is cured. As the adhesive, for example, an adhesive made of an ultraviolet curable resin can be used, and the applied adhesive can be cured by irradiating ultraviolet light thereto. The type of the adhesive is not particularly limited. Instead of the above steps, the adhesive may be applied to at least one of the adjustment convex portions 622A and 622B and the adjustment concave portions 663A and 663B, the positions of the 1 st display module 101A and the 2 nd display module 101B may be adjusted, and then the adhesive may be cured.

In this way, the coupling section 65 has an adjustment structure for adjusting at least one of the relative rotational position, the relative position in the longitudinal direction, and the relative position in the depth direction of the 1 st projection optical support member 62A and the 2 nd projection optical support member 62B by providing the gap C2 between the adjustment convex sections 622A and 622B and the adjustment concave sections 663A and 663B. Instead of the structure of the present embodiment, the gap C2 may be provided only between the 1 st adjusting convex portion 622A and the 1 st adjusting concave portion 663A or between the 2 nd adjusting convex portion 622B and the 2 nd adjusting concave portion 663B, and the gap C2 may not be provided on the other. In this configuration, only the display modules 101A and 101B on the side where the gap C2 is provided and the coupling member 66 can be adjusted in position, but even in this case, the 1 st display module 101A and the 2 nd display module 101B can be adjusted in position relative to each other. The above-described adjustment structure may be any structure as long as the position adjustment can be performed in the middle of the manufacturing process of the virtual image display device 100, and may be fixed by an adhesive or the like after the position adjustment. That is, the above-described adjustment structure means a structure in which the position adjustment is not necessarily possible even after the virtual image display device 100 is completed. However, the position may be adjusted after the virtual image display device 100 is completed.

As described above, the method for manufacturing the virtual image display device 100 according to the present embodiment includes the steps of: a1 st adjustment step of adjusting at least one of a relative rotational position, a relative position in a lateral direction, a relative position in a longitudinal direction, and a relative position in a depth direction of the 1 st display element support member 61A and the 1 st projection optical support member 62A in the 1 st display module 101A in a state where the convex portion 611 and the concave portion 621 are fitted; a 2 nd adjustment step of adjusting at least one of a relative rotational position, a relative position in the lateral direction, a relative position in the longitudinal direction, and a relative position in the depth direction of the 2 nd display element support member 61B and the 2 nd projection optical support member 62B in the 2 nd display module 101B in a state where the convex portion 611 and the concave portion 621 are fitted; and a 3 rd adjustment step of adjusting at least one of the relative rotational position, the relative position in the vertical direction, and the relative position in the depth direction of the 1 st projection optical support member 62A and the 2 nd projection optical support member 62B using the adjustment structure of the coupling section 65.

As described above, in the virtual image display device 100 of the present embodiment, since aberration can be corrected by the prism 22, it is possible to improve resolution and to reduce the size of an optical system, and further, to reduce the size of the entire device. In the decentering plane SO of the decentering system 112, the intermediate pupil IP is disposed between the projection lens 21 and the internal reflection surface 22b and at a position closer to the entrance surface 22a of the prism 22 than the projection lens 21 and the internal reflection surface 22b, SO that it is easy to ensure the decentering property on the display element 11 side while avoiding an increase in size of the optical system. Further, by disposing the intermediate pupil IP at this position, it is easy to shorten the focal length and increase the magnification, and the display element 11 can be reduced in size while the display element 11 is brought close to the prism 22 or the like. Further, since the intermediate image IM is formed between the prism 22 and the see-through mirror 23, the prism 22 can be reduced in size.

Further, according to the virtual image display device 100 of the present embodiment, both the relative positional relationship between the display elements 11 and the projection optical system 12 in the display modules 101A and 101B and the relative positional relationship between the 1 st display module 101A and the 2 nd display module 101B can be appropriately adjusted in the assembly process at the time of manufacturing the virtual image display device 100. This makes it possible to appropriately correct distortion of an image, suppress deterioration in resolution of a virtual image due to distortion correction, reduce a feeling of discomfort when the virtual image is viewed with both eyes, and improve display quality.

In the virtual image display device 100 according to the present embodiment, since the connection portion 65 includes the connection member 66 provided separately from the 1 st projection optical support member 62A and the 2 nd projection optical support member 62B, the connection member 66 also functions as a support member that supports the 1 st projection optical support member 62A and the 2 nd projection optical support member 62B when the 1 st display module 101A and the 2 nd display module 101B are adjusted in position. This enables the position adjustment work of the 1 st display module 101A and the 2 nd display module 101B to be performed stably. Further, the existence of the coupling member 66 enables a wide adhesive surface to be obtained, and the mechanical strength of the coupling portion 65 between the 1 st display module 101A and the 2 nd display module 101B can be ensured.

In the virtual image display device 100 according to the present embodiment, since each of the display element support members 61A and 61B has the convex portion 611 protruding in the lateral direction from the side surface of each of the display element support member main bodies 610, and each of the projection optical support members 62A and 62B has the concave portion 621 facing each of the convex portions 611, the position adjustment of each of the display element support members 61A and 61B and each of the projection optical support members 62A and 62B can be performed so that the convex portions 611 and the concave portions 621 fit each other.

In the virtual image display device 100 according to the present embodiment, since each convex portion 611 has an opposing surface that intersects the lateral direction, the vertical direction, and the depth direction, and each concave portion 621 has an opposing surface that opposes the opposing surface of each convex portion 611, the position adjustment of the display element support members 61A and 61B and the projection optical support members 62A and 62B in the 6-axis direction can be performed precisely.

In the virtual image display device 100 according to the present embodiment, the projection lens 21, the prism 22, and the see-through mirror 23 constituting the projection optical systems 12A and 12B are bonded to each other via an adhesive layer without using other members, so that the display modules 101A and 101B can be downsized, and the positioning accuracy of the projection lens 21, the prism 22, and the see-through mirror 23 can be ensured.

[ 2 nd embodiment ]

Hereinafter, embodiment 2 of the present invention will be described with reference to fig. 13.

The virtual image display device according to embodiment 2 has the same basic configuration as that of embodiment 1, and the configuration of the connection section is different from that of embodiment 1. Therefore, the explanation of the overall structure of the virtual image display device is omitted.

Fig. 13 is a perspective view of the 1 st display module 201A and the 2 nd display module 201B in the virtual image display device 200 according to the present embodiment.

In fig. 13, the same components as those in the drawings used in embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

In the virtual image display device 100 according to embodiment 1, the connection section 65 includes a connection member 66 that connects the 1 st display module 101A and the 2 nd display module 101B to each other. In contrast, in the virtual image display device 200 of the present embodiment, the connection section 75 does not include a connection member that connects the 1 st display module 201A and the 2 nd display module 201B to each other.

As shown in fig. 13, in the virtual image display device 200 according to the present embodiment, the connection section 75 includes a1 st connection section 721A provided integrally with the 1 st projection optical support member 72A and a 2 nd connection section 721B provided integrally with the 2 nd projection optical support member 72B.

The 1 st connecting part 721A extends from the 1 st projection optical support member main body toward one side in the lateral direction (+ X direction). The 1 st coupling part 721A is provided with a1 st engaging part 721c at a distal end portion extending in the + X direction for adjusting a relative rotational position with respect to the 2 nd projection optical support member 72B, a relative position in the lateral direction, a relative position in the longitudinal direction, and a relative position in the depth direction. The 2 nd connecting part 721B extends from the 2 nd projection optical support member main body toward the other side in the lateral direction (the (-X direction). The 2 nd coupling part 721B is provided with a 2 nd engaging part 721d at a distal end part extending in the-X direction for adjusting a relative rotational position with respect to the 1 st projection optical support member 72A, a relative position in the lateral direction, a relative position in the longitudinal direction, and a relative position in the depth direction.

Specifically, the 1 st engaging portion 721c is constituted by: a convex portion located at the front (+ Z direction) and protruding in a direction in which the 2 nd projection optical support member 72B is provided; and a concave portion located more rearward (-Z direction) than the convex portion and recessed in a direction opposite to the direction in which the 2 nd projection optical support member 72B is provided. The 2 nd engaging portion 721d is constituted by: a convex portion located at the rear (in the (-Z direction) and protruding in a direction in which the 1 st projection optical support member 72A is provided; and a concave portion located forward (+ Z direction) of the convex portion and recessed in a direction opposite to a direction in which the 1 st projection optical support member 72A is provided. The 1 st projection optical support member 72A and the 2 nd projection optical support member 72B are disposed at positions where the convex portion of the 1 st engagement portion 721c engages with the concave portion of the 2 nd engagement portion 721d, and the concave portion of the 1 st engagement portion 721c engages with the convex portion of the 2 nd engagement portion 721 d.

A gap C3 is provided between the 1 st engagement portion 721C and the 2 nd engagement portion 721 d. The gap C3 is, for example, about several tens μm to 1mm in size. The adhesive layer 67 is provided in the gap C3. That is, the 1 st projection optical support member 72A and the 2 nd projection optical support member 72B are coupled to each other by the adhesive layer 67 provided in the gap C3 in a state where the positional relationship between them is adjusted. In this way, the engagement between the 1 st engagement portion 721c and the 2 nd engagement portion 721d may be fixed by a bonding material such as the adhesive layer 67, or may be fixed by fitting the convex portion and the concave portion without using the bonding material.

The other configurations of the virtual image display device 200 are the same as those of the virtual image display device 100 of embodiment 1.

In the virtual image display device 200 according to the present embodiment, when the 1 st display module 201A and the 2 nd display module 201B are adjusted in position, for example, the 1 st display module 201A is moved while the 2 nd display module 201B is held by an arbitrary jig, and the positional relationship between the 1 st display module 201A and the 2 nd display module 201B is adjusted. At this time, since the gap C3 of, for example, about 1mm is provided between the 1 st engaging portion 721C and the 2 nd engaging portion 721d, the relative position in the lateral direction (X direction), the longitudinal direction (Y direction), and the depth direction (Z direction) of the 1 st display module 201A and the 2 nd display module 201B, and the relative position around the X axis, the relative position around the Y axis, and the relative position around the Z axis of the 1 st display module 201A and the 2 nd display module 201B can be adjusted, respectively. In the present embodiment, as in embodiment 1, the adjustment structure may be a structure in which the position can be adjusted in the middle of the manufacturing process of the virtual image display device 200, and may be fixed via the adhesive layer 67 after the position adjustment.

In the present embodiment, the following effects similar to those of embodiment 1 can be obtained: the virtual image display device 200 can be reduced in size, distortion of the virtual image can be appropriately corrected, discomfort when the virtual image is observed with both eyes can be reduced, and display quality can be improved.

In particular, in the case of the present embodiment, since the connection section 75 does not have a separate connection member from the 1 st display module 201A and the 2 nd display module 201B, the number of components of the virtual image display device 200 can be reduced.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

For example, in the virtual image display device of the above embodiment, the connection section has an adjustment structure capable of adjusting the positions of the 1 st display module and the 2 nd display module in the 6-axis direction, but may have an adjustment structure capable of adjusting the positions of the display modules in the 5-axis direction other than the relative positions in the lateral direction.

In the above embodiment, the plurality of surfaces constituting the respective convex portions and the respective concave portions are perpendicular to each other, but the plurality of surfaces may not necessarily be perpendicular to each other, and for example, adjacent surfaces may form an acute angle or an obtuse angle. In the above embodiment, the convex portion and the concave portion having a substantially rectangular parallelepiped shape are provided, but instead of this configuration, for example, a configuration may be adopted in which the convex portion is formed by a pin, the concave portion is formed by a hole, and the position of 2 optical members is adjusted by fitting the pin into the hole having a gap. In the above-described embodiment, the projection optical support member of each display module has the adjustment convex portion and the coupling member has the adjustment concave portion as the coupling portion, but in contrast to this configuration, the coupling member may have the adjustment convex portion and the projection optical support member of each display module may have the adjustment concave portion that accommodates the adjustment convex portion therein.

In the above embodiment, the example in which the projection lens, the prism, and the see-through mirror constituting the projection optical system are bonded to each other via the adhesive layer has been described, but the projection lens, the prism, and the see-through mirror may be coupled to each other via another support member. In the above embodiment, the projection lens is constituted by 1 lens, but may be constituted by a plurality of lenses. In the above-described embodiment, the examples of the projection lens, the prism, and the transmission mirror are given as the optical members constituting the projection optical system, but other optical members such as a reflection type volume hologram element and a fresnel lens may be used.

The specific configurations of the number, arrangement, shape, material, and the like of the various components constituting the virtual image display device are not limited to those in the above embodiments, and can be appropriately changed.

In the above-described embodiment, a head mount display is described as an example of the virtual image display device, but the present invention can be applied to a display of a type in which the device body is held by a hand to be peeped, such as a binocular, a so-called handheld display.

The virtual image display device according to one embodiment of the present invention may have the following configuration.

A virtual image display device according to one embodiment of the present invention includes: a1 st display module forming a1 st virtual image with respect to a right eye; a 2 nd display module forming a 2 nd virtual image with respect to a left eye; and a coupling part coupling the 1 st display module and the 2 nd display module, wherein the 1 st display module includes: a1 st display element that emits 1 st image light for forming a right-eye image; a1 st display element support member that supports the 1 st display element; a1 st projection optical system that projects the 1 st image light emitted from the 1 st display element to form a1 st emission pupil; and a1 st projection optical support member that supports the 1 st projection optical system, wherein the 1 st display element support member has one of a1 st convex portion and a1 st concave portion, the 1 st projection optical support member has the other of the 1 st convex portion and the 1 st concave portion, the 1 st convex portion is disposed inside the 1 st concave portion with a gap therebetween, and the 2 nd display module includes: a 2 nd display element that emits 2 nd image light for forming a left eye image; a 2 nd display element support member that supports the 2 nd display element; a 2 nd projection optical system that projects the 2 nd image light emitted from the 2 nd display element to form a 2 nd emission pupil; and a 2 nd projection optical support member that supports the 2 nd projection optical system, wherein the 2 nd display element support member has one of a 2 nd convex portion and a 2 nd concave portion, the 2 nd projection optical support member has the other of the 2 nd convex portion and the 2 nd concave portion, the 2 nd convex portion is disposed inside the 2 nd concave portion with a gap therebetween, and the coupling portion has an adjustment structure that enables adjustment of at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction of the 1 st projection optical support member and the 2 nd projection optical support member.

In the virtual image display device according to one aspect of the present invention, the coupling portion may include a coupling member that is provided separately from the 1 st projection optical support member and the 2 nd projection optical support member and couples the 1 st projection optical support member and the 2 nd projection optical support member, the 1 st projection optical support member may include a1 st adjustment convex portion for adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction with respect to the 2 nd projection optical support member, the 2 nd projection optical support member may include a 2 nd adjustment convex portion for adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction with respect to the 1 st projection optical support member, and the coupling member may include an adjustment concave portion that accommodates the 1 st adjustment convex portion and the 2 nd adjustment convex portion, gaps are provided between the 1 st and 2 nd adjusting protrusions and the adjusting recesses.

In the virtual image display device according to one aspect of the present invention, the coupling portion may include a1 st coupling portion provided integrally with the 1 st projection optical support member and a 2 nd coupling portion provided integrally with the 2 nd projection optical support member, the 1 st coupling portion may include a1 st engagement portion for adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction with respect to the 2 nd projection optical support member, the 2 nd coupling portion may include a 2 nd engagement portion for engaging with the 1 st engagement portion to adjust at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction with respect to the 1 st projection optical support member, and the 1 st engagement portion may be disposed with a gap between the 1 st engagement portion and the 2 nd engagement portion.

In the virtual image display device according to one aspect of the present invention, the 1 st display element support member may include a1 st display element support member main body and the 1 st convex portion protruding in the lateral direction from a side surface of the 1 st display element support member main body, the 1 st projection optical support member may include the 1 st concave portion facing the 1 st convex portion, the 2 nd display element support member may include a 2 nd display element support member main body and the 2 nd convex portion protruding in the lateral direction from a side surface of the 2 nd display element support member main body, and the 2 nd projection optical support member may include the 2 nd concave portion facing the 2 nd convex portion.

In the virtual image display device according to one aspect of the present invention, the 1 st projection may have a1 st facing surface intersecting with the lateral direction, a 2 nd facing surface intersecting with the longitudinal direction, and a 3 rd facing surface intersecting with the depth direction, the 1 st recess may have a 4 th facing surface opposing with the 1 st facing surface, a 5 th facing surface opposing with the 2 nd facing surface, and a 6 th facing surface opposing with the 3 rd facing surface, the 2 nd projection may have a 7 th facing surface intersecting with the lateral direction, an 8 th facing surface intersecting with the longitudinal direction, and a 9 th facing surface intersecting with the depth direction, and the 2 nd recess may have a 10 th facing surface opposing with the 7 th facing surface, an 11 th facing surface opposing with the 8 th facing surface, and a 12 th facing surface opposing with the 9 th facing surface.

In the virtual image display device according to one aspect of the present invention, the 1 st projection optical system may include a1 st projection lens that condenses the 1 st image light emitted from the 1 st display element; a1 st prism which refractively enters the 1 st image light emitted from the 1 st projection lens on an entrance surface, is totally reflected by an internal reflection surface, and refractively emits the 1 st image light from an emission surface; and a1 st see-through mirror that reflects the 1 st image light emitted from the 1 st prism toward a pupil position to form the exit pupil, wherein the 1 st projection lens, the 1 st prism, and the 1 st see-through mirror are bonded to each other via an adhesive layer, and the 2 nd projection optical system includes: a 2 nd projection lens that condenses the 2 nd image light emitted from the 2 nd display element; a 2 nd prism which refractively enters the 2 nd image light emitted from the 2 nd projection lens on an entrance surface, is totally reflected by an internal reflection surface, and refractively emits the 2 nd image light from an emission surface; and a 2 nd see-through mirror that reflects the 2 nd image light emitted from the 2 nd prism toward a pupil position to form the exit pupil, wherein the 2 nd projection lens, the 2 nd prism, and the 2 nd see-through mirror are bonded to each other via an adhesive layer.

In the virtual image display device according to one aspect of the present invention, the image displayed on the 1 st display element may have distortion that cancels distortion formed by the 1 st projection lens, the 1 st prism, and the 1 st see-through mirror, and the image displayed on the 2 nd display element may have distortion that cancels distortion formed by the 2 nd projection lens, the 2 nd prism, and the 2 nd see-through mirror.

The virtual image display device according to one embodiment of the present invention may be manufactured as follows.

In a method for manufacturing a virtual image display device according to an aspect of the present invention, the virtual image display device includes: a1 st display module forming a1 st virtual image with respect to a right eye; a 2 nd display module forming a 2 nd virtual image with respect to a left eye; and a coupling part coupling the 1 st display module and the 2 nd display module, wherein the 1 st display module includes: a1 st display element that emits 1 st image light for the right eye; a1 st display element support member that supports the 1 st display element; a1 st projection optical system that projects the 1 st image light emitted from the 1 st display element to form a1 st emission pupil; and a1 st projection optical support member that supports the 1 st projection optical system, wherein the 1 st display element support member has one of a1 st convex portion and a1 st concave portion, the 1 st projection optical support member has the other of the 1 st convex portion and the 1 st concave portion, the 1 st convex portion is disposed inside the 1 st concave portion with a gap therebetween, and the 2 nd display module includes: a 2 nd display element that emits 2 nd image light for the left eye; a 2 nd display element support member that supports the 2 nd display element; a 2 nd projection optical system that projects the 2 nd image light emitted from the 2 nd display element to form a 2 nd emission pupil; and a 2 nd projection optical support member that supports the 2 nd projection optical system, wherein the 2 nd display element support member has one of a 2 nd convex portion and a 2 nd concave portion, the 2 nd projection optical support member has the other of the 2 nd convex portion and the 2 nd concave portion, the 2 nd convex portion is disposed inside the 2 nd concave portion with a gap therebetween, and the coupling portion has an adjustment structure that adjusts a relative positional relationship between the 1 st projection optical support member and the 2 nd projection optical support member, the method for manufacturing the virtual image display device including: a1 st adjustment step of adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, a relative position in a lateral direction, and a relative position in a depth direction of the 1 st display element support member and the 1 st projection optical support member in a state where the 1 st projection portion and the 1 st recess portion are fitted to each other; a 2 nd adjustment step of adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, a relative position in a lateral direction, and a relative position in a depth direction of the 2 nd display element support member and the 2 nd projection optical support member in a state where the 2 nd convex portion and the 2 nd concave portion are fitted; and a 3 rd adjustment step of adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction of the 1 st projection optical support member and the 2 nd projection optical support member using the adjustment structure of the coupling portion.

Claims (8)

1. A virtual image display device, comprising:

a1 st display module forming a1 st virtual image with respect to a right eye;

a 2 nd display module forming a 2 nd virtual image with respect to a left eye; and

a connection part connecting the 1 st display module and the 2 nd display module,

the 1 st display module has:

a1 st display element that emits 1 st image light for forming a right-eye image;

a1 st display element support member that supports the 1 st display element;

a1 st projection optical system that projects the 1 st image light emitted from the 1 st display element to form a1 st emission pupil; and

a1 st projection optical support member that supports the 1 st projection optical system,

the 1 st display element supporting member has either one of a1 st convex portion and a1 st concave portion,

the 1 st projection optical support member has either the 1 st convex portion or the 1 st concave portion,

the 1 st convex part is arranged in the 1 st concave part with a gap between the 1 st convex part and the 1 st concave part,

the 2 nd display module has:

a 2 nd display element that emits 2 nd image light for forming a left eye image;

a 2 nd display element support member that supports the 2 nd display element;

a 2 nd projection optical system that projects the 2 nd image light emitted from the 2 nd display element to form a 2 nd emission pupil; and

a 2 nd projection optical support member that supports the 2 nd projection optical system,

the 2 nd display element supporting member has either one of a 2 nd convex portion and a 2 nd concave portion,

the 2 nd projection optical support member has either the 2 nd convex part or the 2 nd concave part,

the 2 nd convex part is arranged in the 2 nd concave part with a gap between the 2 nd convex part and the 2 nd concave part,

the coupling portion has an adjustment structure capable of adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction of the 1 st projection optical support member and the 2 nd projection optical support member.

2. The virtual image display device of claim 1,

the coupling part includes a coupling member that is provided separately from the 1 st projection optical support member and the 2 nd projection optical support member and couples the 1 st projection optical support member and the 2 nd projection optical support member,

the 1 st projection optical support member has a1 st adjustment convex portion for adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction with respect to the 2 nd projection optical support member,

the 2 nd projection optical support member has a 2 nd adjustment convex portion for adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction with respect to the 1 st projection optical support member,

the coupling member has an adjustment concave portion for accommodating the 1 st adjustment convex portion and the 2 nd adjustment convex portion, and a gap is provided between the adjustment concave portion and the 1 st adjustment convex portion and the 2 nd adjustment convex portion.

3. The virtual image display device of claim 1,

the coupling portion has a1 st coupling portion provided integrally with the 1 st projection optical support member and a 2 nd coupling portion provided integrally with the 2 nd projection optical support member,

the 1 st coupling part has a1 st engaging part for adjusting at least one of a relative rotational position with respect to the 2 nd projection optical support member, a relative position in a longitudinal direction, and a relative position in a depth direction,

the 2 nd coupling part has a 2 nd engaging part for engaging with the 1 st engaging part to adjust at least one of a relative rotational position with respect to the 1 st projection optical support member, a relative position in a longitudinal direction, and a relative position in a depth direction,

the 1 st engaging portion is disposed with a gap from the 2 nd engaging portion.

4. A virtual image display device according to any one of claims 1 to 3,

the 1 st display element support member has a1 st display element support member main body and the 1 st projection projecting in the lateral direction from a side surface of the 1 st display element support member main body,

the 1 st projection optical support member has the 1 st concave portion opposed to the 1 st convex portion,

the 2 nd display element support member has a 2 nd display element support member main body and the 2 nd convex portion protruding in the lateral direction from a side surface of the 2 nd display element support member main body,

the 2 nd projection optical support member has the 2 nd concave portion opposed to the 2 nd convex portion.

5. The virtual image display device of claim 4,

the 1 st projection has a1 st facing surface intersecting with the lateral direction, a 2 nd facing surface intersecting with the longitudinal direction, and a 3 rd facing surface intersecting with the depth direction,

the 1 st recess has a 4 th opposed surface opposed to the 1 st opposed surface, a 5 th opposed surface opposed to the 2 nd opposed surface, and a 6 th opposed surface opposed to the 3 rd opposed surface,

the 2 nd convex part has a 7 th opposed surface crossing the lateral direction, an 8 th opposed surface crossing the longitudinal direction, and a 9 th opposed surface crossing the depth direction,

the 2 nd recess has a 10 th facing surface facing the 7 th facing surface, an 11 th facing surface facing the 8 th facing surface, and a 12 th facing surface facing the 9 th facing surface.

6. A virtual image display device according to any one of claims 1 to 3,

the 1 st projection optical system has a light source,

a1 st projection lens that condenses the 1 st image light emitted from the 1 st display element;

a1 st prism which refractively enters the 1 st image light emitted from the 1 st projection lens on an entrance surface, is totally reflected by an internal reflection surface, and refractively emits the 1 st image light from an emission surface; and

a1 st see-through mirror that reflects the 1 st image light emitted from the 1 st prism toward a pupil position to form the exit pupil,

the 1 st projection lens, the 1 st prism, and the 1 st see-through mirror are bonded to each other via an adhesive layer,

the 2 nd projection optical system has:

a 2 nd projection lens that condenses the 2 nd image light emitted from the 2 nd display element;

a 2 nd prism which refractively enters the 2 nd image light emitted from the 2 nd projection lens on an entrance surface, is totally reflected by an internal reflection surface, and refractively emits the 2 nd image light from an emission surface; and

a 2 nd see-through mirror that reflects the 2 nd image light emitted from the 2 nd prism toward a pupil position to form the exit pupil,

the 2 nd projection lens, the 2 nd prism, and the 2 nd see-through mirror are bonded to each other via an adhesive layer.

7. The virtual image display device of claim 6,

an image displayed on the 1 st display element has the following distortion: the distortion cancels out the distortion formed by the 1 st projection lens, the 1 st prism and the 1 st see-through mirror,

the image displayed on the 2 nd display element has the following distortion: the distortion cancels out distortion formed by the 2 nd projection lens, the 2 nd prism, and the 2 nd see-through mirror.

8. A method of manufacturing a virtual image display device, the virtual image display device comprising:

a1 st display module forming a1 st virtual image with respect to a right eye;

a 2 nd display module forming a 2 nd virtual image with respect to a left eye; and

a connection part connecting the 1 st display module and the 2 nd display module,

the 1 st display module has: a1 st display element that emits 1 st image light for the right eye; a1 st display element support member that supports the 1 st display element; a1 st projection optical system that projects the 1 st image light emitted from the 1 st display element to form a1 st emission pupil; and a1 st projection optical support member that supports the 1 st projection optical system,

the 1 st display element support member has either one of a1 st convex portion and a1 st concave portion, the 1 st projection optical support member has either the other of the 1 st convex portion and the 1 st concave portion,

the 1 st convex part is arranged in the 1 st concave part with a gap between the 1 st convex part and the 1 st concave part,

the 2 nd display module has: a 2 nd display element that emits 2 nd image light for the left eye; a 2 nd display element support member that supports the 2 nd display element; a 2 nd projection optical system that projects the 2 nd image light emitted from the 2 nd display element to form a 2 nd emission pupil; and a 2 nd projection optical support member that supports the 2 nd projection optical system,

the 2 nd display element support member has either one of a 2 nd convex portion and a 2 nd concave portion, the 2 nd projection optical support member has either the other of the 2 nd convex portion and the 2 nd concave portion,

the 2 nd convex part is arranged in the 2 nd concave part with a gap between the 2 nd convex part and the 2 nd concave part,

the connecting part has an adjusting structure for adjusting the relative positional relationship between the 1 st projection optical support member and the 2 nd projection optical support member,

the method for manufacturing the virtual image display device comprises the following steps:

a1 st adjustment step of adjusting at least one of a relative rotational position, a relative position in a lateral direction, a relative position in a longitudinal direction, and a relative position in a depth direction of the 1 st display element support member and the 1 st projection optical support member in a state where the 1 st projection portion and the 1 st recess portion are fitted to each other;

a 2 nd adjustment step of adjusting at least one of a relative rotational position, a relative position in a lateral direction, a relative position in a longitudinal direction, and a relative position in a depth direction of the 2 nd display element support member and the 2 nd projection optical support member in a state where the 2 nd convex portion and the 2 nd concave portion are fitted; and

a 3 rd adjustment step of adjusting at least one of a relative rotational position, a relative position in a longitudinal direction, and a relative position in a depth direction of the 1 st projection optical support member and the 2 nd projection optical support member using the adjustment structure of the coupling portion.

Images